No Power, Bogs Down, White Smoke, Fuel Smell

[chlblnz]

I've recently cleared a lot of fault codes on a 2006, 2.0 Duratec Focus. It was in limp mode but have managed to clear all DTCs.

The problem I now have is the car bogs down under acceleration. I'm not sure if it's connected but after about 20 seconds of starting the car, the idle note changes and the car begins to produce a fair bit of white smoke which smells very rich. If I rev the engine up, it spits and bangs a bit and generally doesn't feel great. 

I took it for a quick spin around the block and it's okay on the flat as long as I don't push the accelerator down to quickly. If I do, the revs drop and the engine begins to die. Let off and the engine comes back again. Hills are a bit hit and miss if I'll make it up them. Smokes under acceleration slightly more than just idling.

Things I've checked are;

• I've done a compression check and all cylinders are good.
• I've removed and cleaned up the EGR valve (this is cooled by the main coolant circuit so thought this could be leaking??)
• I've measured the resistance in each of the coil packs. They are all the same.
• I've placed hand on throttle body when idling and there don't appear to be any air leaks.
• I've recently replaced the inlet runner solenoid as that was bringing up a DTC. I bought a cheapo one so could that be the culprit?
• I've placed a spark tester between each coil and spark plug and each plug is sparking.

I'm at a bit of a loose end now as I have no DTCs but this awful performance. 

Anyone have any ideas?

 

Thanks

Will

 

[btmaldon]

Can you remember what the DTC's were before you cleared them? It sounds like it is running far too rich.

[Tdci-Peter]

7 hours ago, chlblnz said:

after about 20 seconds of starting the car, the idle note changes and the car begins to produce a fair bit of white smoke which smells very rich.

It could be an O2 sensor, a leak in the exhaust system before the O2 sensor, or possibly the T-MAP sensor.

It sounds like when the car switches to closed loop control, which uses the O2 sensors to regulate the fuel mixture, it is getting it wrong. The DTCs might possibly help.

A diagnostic system like Forscan can view the inputs from the various sensors, but diagnosing fuel mixture problems can still be difficult. A tune-up or diagnostics specialist might be the best answer.

[chlblnz]

Can you remember what the DTC's were before you cleared them? It sounds like it is running far too rich.

Hi, thanks for the reply.

I did post previously on here about the dtc codes - http://www.fordownersclub.com/forums/index.php?/topic/89152-Limp-Mode

It smells rich but has white smoke. I would have thought it would be a sooty black colour being so rich.

[chlblnz]

It could be an O2 sensor, a leak in the exhaust system before the O2 sensor, or possibly the T-MAP sensor.
It sounds like when the car switches to closed loop control, which uses the O2 sensors to regulate the fuel mixture, it is getting it wrong. The DTCs might possibly help.
A diagnostic system like Forscan can view the inputs from the various sensors, but diagnosing fuel mixture problems can still be difficult. A tune-up or diagnostics specialist might be the best answer.

Thanks for the reply. I'm not getting any more fault codes which is making things mire difficult. I'll check the exhaust system. The TMAP is a real pain to access so fingers crossed it's not that..

[Tdci-Peter]

4 hours ago, chlblnz said:

I'm not getting any more fault codes which is making things mire difficult.

I have just re-read the other post on the DTCs, I had not linked that one with this!

That was a great bit of work, probably solving a nasty little IC problem, and the broken wire. Though I can not quite see what it was that the broken wire was on, was it the TMAP?

Does this rich running problem seem like a continuation of the earlier faults, or something independent. Faults often do seem to come along in groups, like the proverbial number 2 buses .

The lack of DTCs suggests something is out of calibration, or performing badly, but still working just well enough to avoid detection by the ECU. Leaks, O2 sensors & the TMAP can easily go like this.